Answer
Ceṣṭā means effort. And effort cannot exist without desire. First there must be desire; then comes effort—the determination to act in order to fulfill that desire.
So the real principle is:
all our ceṣṭā should be meant to please Krishna.
If Krishna is to be pleased with our effort, then He must be pleased with the desire behind the effort. Therefore, our desires should align with the desires of Guru and Krishna.
We cannot remain inactive—everyone is always engaged in some kind of ceṣṭā. Only in tamo-guṇa does a person lose even the inspiration to act. Otherwise, activity is natural. The question is: in which direction is that activity going?
In devotional life, ceṣṭā itself becomes service.
When you chant, for example:
You apply effort to hear,
Effort to pronounce,
Effort to remain attentive.
This is offering your ceṣṭā-śakti (the energy of effort) to Krishna.
But the quality of effort depends on the quality of desire.
If the desire is strong and pure, determination naturally follows. And that produces quality effort.
Then the question arises: how do we develop such desire?
By adopting the desires of pure devotees.
That is why we engage in the mission of great ācāryas like A. C. Bhaktivedanta Swami Prabhupada. Activities such as distributing spiritual knowledge, serving the community, and spreading Krishna consciousness are not ordinary—they are expressions of his desire.
And because they are his desires, we know with confidence:
engaging in them is pleasing to Krishna.
So the process is:
Align your desire with Guru and Krishna,
Apply sincere and steady effort,
Offer that effort as service.
In this way, ceṣṭā becomes bhakti, and our entire activity becomes an offering meant to please the Lord.